Hi @be-a-fighter
Please follow these steps to add social links.
– Go to Appearance >> Menus.
– Click on create a new menu, name it Social Menu and assign it to Social Links.
– Click on Custom Links
– Add full URL of social networking sites like Facebook, Twitter, Instagram, etc to it and click on Save Menu.
You can check this video too https://www.youtube.com/watch?v=dU4WSKUMW5o
Hope you can setup social links now.
Thank you.